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  1. #391
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    59
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    6,540

    Default

    I learnt that when boring Al, watch out for the built up edge as it is enough to take the bore a few thou oversize (damn!)

    Michael

  2. #392
    Join Date
    Oct 2010
    Location
    melbourne, laverton
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    1,910

    Default besides

    Quote Originally Posted by Michael G View Post
    I learnt that when boring Al, watch out for the built up edge as it is enough to take the bore a few thou oversize (damn!)

    Michael
    Michael. what if it wasn't the claged up cutting edge that was responsible for your job ending up undersize.

  3. #393
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    Oct 2011
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    Norwood-ish, Adelaide
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    Quote Originally Posted by azzrock View Post
    What if it wasn't the claged up cutting edge that was responsible for your job ending up undersize.
    Pretty sure it was. Sequence of events was
    Bored hole (several spring cuts) - measure bore - work out amount of feed required - dial in feed - bore hole - measure again - exclaim because the hole is 2 thou over size - notice build up on tip - exclaim again.

    Made usable with bearing glue but I would have liked a neater fit (with the diameters I'm working with that means almost size for size). I may have to remake if things are too out of wack.

    Michael

  4. #394
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    733

    Default Accidentally learned how to cut a left hand internal thread

    Decided it was easier for me to work from headstock towards tailstock when cutting an internal thread.

    Was getting quite peeved when testing the threaded bar in the hole, couldn't figure out why it wouldn't even try to go in, checked all depths and diameters, shaved a smidge off and no change. That moment when the two threads fit together has become quite satisfying and relatively easy to achieve over the last week, so I was very puzzled

    Looking at the workpiece - flash of understanding inside my head - realised I had cut an internal left hand thread. Doh ? Although I now reckon left hand threads will always be easier to cut than RH threads because you always end up coming off of or out of the workpiece.

    Thoroughly enjoying learning how to cut threads on lathe - quite amazed at how everything works and fits together - was thinking "Gosh I'm good" but then realised that its the lathe that is accurate rather than me.

    Have duplicated my lathe headstock thread as I figured that would be a handy thing to have as a test gauge - was absolutely gobsmacked when it worked and fitted perfectly into the chucks - although the long term aim was to be able to do these sort of things I was always a bit daunted by the thought of threadcutting.

    Considered building a jig to cut perfect 60 degree tool and then thought "no stuff it, wasting too much time, just do it" - and it worked ! However some sort of jig might be easier. Its been added to the list of things to make.

    I guess I'm lucky it was a test piece and not the real job, I'd be stuck with a left hand threaded faceplate.

    Bill

  5. #395
    Join Date
    Jun 2011
    Location
    gold coast
    Posts
    303

    Default

    I have to congratulate you , Bill.
    Great minds think alike.
    Only a week ago I set up to cut my first thread, after several weeks of reading/ Utube etc and a some steep learning curve lathe operational education.
    The thread form looked good, the pitch gauge settled on delightfully, BUT the thread was left hand.
    How was I to know that the 'standard' way to cut a thread was towards the chuck--not towards the tailstock.
    After all, I do most of my turning that way--cos without any knowledge except observation--I figured that there was more chance of crashing the carriage into the chuck, if I power fed towards the chuck and not the other way.
    A timely lesson yesterday from my mate Daryl, has put me on the one 'twue way",--- and not before time.
    regards
    Brian

  6. #396
    Join Date
    Aug 2010
    Location
    Toorloo Arm, VIC
    Age
    39
    Posts
    1,270

    Default

    I was reminded yesterday that when flaring steel tubing (clutch pipe in this case), it generally works much better when you put the tube nut on the pipe BEFORE you flare it.....

  7. #397
    Join Date
    Jan 2011
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    Far West Wimmera
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    63
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    Quote Originally Posted by Jekyll and Hyde View Post
    I was reminded yesterday that when flaring steel tubing (clutch pipe in this case), it generally works much better when you put the tube nut on the pipe BEFORE you flare it.....
    I have been given the same reminder many many times with copper house plumbing, wiring connectors and anything else you can think of. The problem is that a reminder is fine but remembering next time is a completely different matter.

    Dean

  8. #398
    Join Date
    Nov 2011
    Location
    Sutherland Shire, Sydney
    Age
    71
    Posts
    65

    Default Yes, but...

    Quote Originally Posted by Jekyll and Hyde View Post
    I was reminded yesterday that when flaring steel tubing (clutch pipe in this case), it generally works much better when you put the tube nut on the pipe BEFORE you flare it.....
    Ah yes, but you also have to make sure the nut is facing the correct way when you remember to put the nut on the tubing! DAMHIKT

    Alan...

  9. #399
    Join Date
    Jan 2011
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    Far West Wimmera
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    63
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    Quote Originally Posted by Uncle Al View Post
    Ah yes, but you also have to make sure the nut is facing the correct way when you remember to put the nut on the tubing! DAMHIKT

    Alan...
    I'm confused! Which nut are you talking about? I usually face in the direction that lines the nut up with the union as I hold the pipe in my hand. Usually the union to the right. That way I know I have the other nut on the right end!

    Dean

  10. #400
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    72
    Posts
    3,102

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    Ah yes. Experience is a wonderful thing!
    It allows you to recognise mistakes immediately - when you make the AGAIN....
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  11. #401
    Join Date
    Nov 2011
    Location
    Sutherland Shire, Sydney
    Age
    71
    Posts
    65

    Default 2 ways

    Quote Originally Posted by Oldneweng View Post
    I'm confused! Which nut are you talking about? I usually face in the direction that lines the nut up with the union as I hold the pipe in my hand. Usually the union to the right. That way I know I have the other nut on the right end!

    Dean
    Just make sure the bit that mates with the wheel cylinder etc. is facing the correct way. A real bugger when you get it wrong!.

    Alan...

  12. #402
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    Jan 2011
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    Far West Wimmera
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    Quote Originally Posted by Uncle Al View Post
    Just make sure the bit that mates with the wheel cylinder etc. is facing the correct way. A real bugger when you get it wrong!.

    Alan...
    I was wondering about the other nut. The one holding the pipe who is about to make yet another mistake.

    Dean

  13. #403
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
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    71
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    5,942

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    I'm worried for the nut that holds the nut, to make the same mistake within 5 minutes, wrong nut then right nut back to front.

  14. #404
    Join Date
    Nov 2011
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    Sutherland Shire, Sydney
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    65

    Default Nuts

    Quote Originally Posted by Oldneweng View Post
    I was wondering about the other nut. The one holding the pipe who is about to make yet another mistake.

    Dean
    Oops, didn't read your reply correctly. It seems that the nut in front of the steering wheel has a lot to answer for!.

    Alan...

  15. #405
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    Jan 2011
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    Far West Wimmera
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    Default

    Quote Originally Posted by Uncle Al View Post
    Oops, didn't read your reply correctly. It seems that the nut in front of the steering wheel has a lot to answer for!.

    Alan...
    Yes. You could say that. Saw an incident on the road today that was too close for comfort. Very large tractor blocking almost the whole lane as well as the side of the road. A ute was right behind it. We had a B-Double in front as we approached on a straight. The double pulled out to go around. Plenty of space until the ute decided to pull out without looking. I was expecting the inevitable but I think that nut was saved by the quick reflexes of the double driver. He swung almost completely off the road on the other side. Hard and fast. A very tricky move. This is a 2 lane road, not very wide and with Red Gums all along the sides just waiting. I was staying way back as I usually do.

    Dean

    Edit. I learnt that my habit of sitting way back when driving is a damn good one.

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